WAN load balancing question

[christopher_tan]

Hello All,

I need some help on below.

- ISP-1 provided two routers (R1 and R2), each router connect to a different internet circuit (ISP-1 and ISP-2 circuits)

- Locally have a customer router (R3)

- Locally have a public DMZ (203.xxx.xxx.xxx/24)

Requirement:-

1. Incoming/Outgoing traffics to/from DMZ should via both circuits equally (Load Balance)

2. R3 need to know where to route to internet

3. When there is outage on either internet circuit, no outage should occur. All traffics will route on the working circuit

Attach diagram what i think it will work base on the requirement. But i am not sure how the actual router configuraiton should look likes.

If it will not work base on the diagram, please help advice how can it be done.

Appreciate your time.

Regards,

Christopher

[christopher_tan]

anyone have suggestion on this?

[Tagir Temirgaliyev]

I think you can remove R1 and R2 . connect R3 2 links to ISP and it will work. any routing protocol possible. rip ospf bgp , even static routes

[Masoud Pourshabanian]

Hello,

Please take look at the links below. First one is step by step configuration to acheive that.

http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13762-40.html

http://www.cisco.com/networkers/nw00/pres/3203/3203_sec6_c1_Retana.pdf

[paul driver]

Hello

For the to LB within IBGP -  This could be a way forward

R1
router bgp (IBGP)
 neighbor 10.251.100.42 remote-as (IBGP)
 neighbor 10.251.100.42 next-hop-self
 neighbor 10.251.100.34 remote-as (IBGP)
 neighbor 10.251.100.34 next-hop-self
bgp dmzlink-bw
neighbor 125.23.144.125 remote-as (EBGP)
neighbor 125.23.144.125 send community
neighbor 125.23.144.125 dmzlink-bw 

R2
router bgp (IBGP)
 neighbor 10.251.100.41 remote-as (IBGP)
 neighbor 10.251.100.41 next-hop-self
 neighbor 10.251.100.38 remote-as (IBGP)
 neighbor 10.251.100.38 next-hop-self
bgp dmzlink-bw
neighbor 125.23.144.157 remote-as (EBGP)
neighbor 125.23.144.157 send community
neighbor 125.23.144.157 dmzlink-bw 


R3
router bgp (IBGP)
neighbor 10.251.100.37 remote-as (IBGP)
neighbor 10.251.100.33 remote-as (IBGP)
bgp dmzlink-bw
maximum-paths ibgp 2

res
paul

[Murad]

Hi Christopher,

Follow the configurations from Paul and see what results you get. Plz come back when you have some input.

Thanks